pong: rewrite into typescript
This commit is contained in:
parent
d3f77572e9
commit
eb060589fe
226
src/pong.js
226
src/pong.js
@ -1,226 +0,0 @@
|
||||
const canvas = document.getElementById('pong');
|
||||
const context = canvas.getContext('2d');
|
||||
const grid = 15;
|
||||
const paddleHeight = grid * 5; // 80
|
||||
const maxPaddleY = canvas.height - grid - paddleHeight;
|
||||
|
||||
var paddleSpeed = 6;
|
||||
var ballSpeed = 5;
|
||||
|
||||
var leftScore = 0;
|
||||
var rightScore = 0;
|
||||
|
||||
const leftPaddle = {
|
||||
// start in the middle of the game on the left side
|
||||
x: grid * 2,
|
||||
y: canvas.height / 2 - paddleHeight / 2,
|
||||
width: grid,
|
||||
height: paddleHeight,
|
||||
|
||||
// paddle velocity
|
||||
dy: 0
|
||||
};
|
||||
const rightPaddle = {
|
||||
// start in the middle of the game on the right side
|
||||
x: canvas.width - grid * 3,
|
||||
y: canvas.height / 2 - paddleHeight / 2,
|
||||
width: grid,
|
||||
height: paddleHeight,
|
||||
|
||||
// paddle velocity
|
||||
dy: 0
|
||||
};
|
||||
const ball = {
|
||||
// start in the middle of the game
|
||||
x: canvas.width / 2,
|
||||
y: canvas.height / 2,
|
||||
width: grid,
|
||||
height: grid,
|
||||
|
||||
// keep track of when need to reset the ball position
|
||||
resetting: false,
|
||||
|
||||
// ball velocity (start going to the top-right corner)
|
||||
dx: ballSpeed,
|
||||
dy: -ballSpeed
|
||||
};
|
||||
|
||||
// check for collision between two objects using axis-aligned bounding box (AABB)
|
||||
// @see https://developer.mozilla.org/en-US/docs/Games/Techniques/2D_collision_detection
|
||||
function collides(obj1, obj2) {
|
||||
return obj1.x < obj2.x + obj2.width &&
|
||||
obj1.x + obj1.width > obj2.x &&
|
||||
obj1.y < obj2.y + obj2.height &&
|
||||
obj1.y + obj1.height > obj2.y;
|
||||
}
|
||||
|
||||
function gameOver() {
|
||||
context.clearRect(0, 0, canvas.width, canvas.height);
|
||||
let restartGame = document.getElementById("restart");
|
||||
let gameOverText = document.getElementById("gameover");
|
||||
restartGame.hidden = false;
|
||||
gameOverText.hidden = false;
|
||||
}
|
||||
|
||||
function restartGame() {
|
||||
leftScore = 0;
|
||||
rightScore = 0;
|
||||
let restartGame = document.getElementById("restart");
|
||||
restartGame.hidden = true;
|
||||
requestAnimationFrame(loop);
|
||||
}
|
||||
|
||||
function BotMovesPaddle(paddle) {
|
||||
ballRegion = Math.floor(ball.y / 15);
|
||||
paddleRegion = Math.floor(paddle.y / 15);
|
||||
if (ballRegion < paddleRegion) paddle.dy = -paddleSpeed;
|
||||
if (ballRegion > paddleRegion) paddle.dy = paddleSpeed;
|
||||
if (ballRegion === paddleRegion) paddle.dy = 0;
|
||||
}
|
||||
|
||||
// game loop
|
||||
function loop() {
|
||||
//if (leftScore < 7 && rightScore < 7) {
|
||||
requestAnimationFrame(loop);
|
||||
//} else if (leftScore >= 7 || rightScore >= 7) {
|
||||
// gameOver();
|
||||
//}
|
||||
context.clearRect(0,0,canvas.width,canvas.height);
|
||||
|
||||
if (ball.dx < 0) {
|
||||
BotMovesPaddle(leftPaddle);
|
||||
document.getElementById("leftPaddle").innerHTML = leftPaddle.y;
|
||||
}
|
||||
if (ball.dx > 0) {
|
||||
BotMovesPaddle(rightPaddle);
|
||||
document.getElementById("rightPaddle").innerHTML = rightPaddle.y;
|
||||
}
|
||||
|
||||
// move paddles by their velocity
|
||||
leftPaddle.y += leftPaddle.dy;
|
||||
rightPaddle.y += rightPaddle.dy;
|
||||
|
||||
// prevent paddles from going through walls
|
||||
if (leftPaddle.y < grid) {
|
||||
leftPaddle.y = grid;
|
||||
}
|
||||
else if (leftPaddle.y > maxPaddleY) {
|
||||
leftPaddle.y = maxPaddleY;
|
||||
}
|
||||
|
||||
if (rightPaddle.y < grid) {
|
||||
rightPaddle.y = grid;
|
||||
}
|
||||
else if (rightPaddle.y > maxPaddleY) {
|
||||
rightPaddle.y = maxPaddleY;
|
||||
}
|
||||
|
||||
// draw paddles
|
||||
context.fillStyle = 'white';
|
||||
context.fillRect(leftPaddle.x, leftPaddle.y, leftPaddle.width, leftPaddle.height);
|
||||
context.fillRect(rightPaddle.x, rightPaddle.y, rightPaddle.width, rightPaddle.height);
|
||||
|
||||
// move ball by its velocity
|
||||
ball.x += ball.dx;
|
||||
ball.y += ball.dy;
|
||||
|
||||
// prevent ball from going through walls by changing its velocity
|
||||
if (ball.y < grid) {
|
||||
ball.y = grid;
|
||||
ball.dy *= -1;
|
||||
}
|
||||
else if (ball.y + grid > canvas.height - grid) {
|
||||
ball.y = canvas.height - grid * 2;
|
||||
ball.dy *= -1;
|
||||
}
|
||||
|
||||
// reset ball if it goes past paddle (but only if we haven't already done so)
|
||||
if ( (ball.x < 0 || ball.x > canvas.width) && !ball.resetting) {
|
||||
ball.resetting = true;
|
||||
|
||||
if (ball.x < 0) {
|
||||
rightScore++;
|
||||
}
|
||||
if (ball.x > canvas.width) {
|
||||
leftScore++;
|
||||
}
|
||||
|
||||
// give some time for the player to recover before launching the ball again
|
||||
setTimeout(() => {
|
||||
ball.resetting = false;
|
||||
ball.x = canvas.width / 2;
|
||||
ball.y = canvas.height / 2;
|
||||
}, 400);
|
||||
}
|
||||
|
||||
// check to see if ball collides with paddle. if they do change x velocity
|
||||
if (collides(ball, leftPaddle)) {
|
||||
ball.dx *= -1;
|
||||
leftPaddle.dy = 0;
|
||||
|
||||
// move ball next to the paddle otherwise the collision will happen again
|
||||
// in the next frame
|
||||
ball.x = leftPaddle.x + leftPaddle.width;
|
||||
}
|
||||
else if (collides(ball, rightPaddle)) {
|
||||
ball.dx *= -1;
|
||||
rightPaddle.dy = 0;
|
||||
|
||||
// move ball next to the paddle otherwise the collision will happen again
|
||||
// in the next frame
|
||||
ball.x = rightPaddle.x - ball.width;
|
||||
}
|
||||
|
||||
// draw score
|
||||
context.font = "30px Arial";
|
||||
context.fillText(leftScore, 200, 50);
|
||||
context.fillText(rightScore, 560, 50);
|
||||
|
||||
// draw ball
|
||||
context.fillRect(ball.x, ball.y, ball.width, ball.height);
|
||||
|
||||
// draw walls
|
||||
context.fillStyle = "#f4dbd6";
|
||||
context.fillRect(0, 0, canvas.width, grid);
|
||||
context.fillRect(0, canvas.height - grid, canvas.width, canvas.height);
|
||||
|
||||
// draw dotted line down the middle
|
||||
for (let i = grid; i < canvas.height - grid; i += grid * 2) {
|
||||
context.fillRect(canvas.width / 2 - grid / 2, i, grid, grid);
|
||||
}
|
||||
}
|
||||
|
||||
// listen to keyboard events to move the paddles
|
||||
document.addEventListener('keydown', function(e) {
|
||||
// up arrow key
|
||||
if (e.which === 38) {
|
||||
rightPaddle.dy = -paddleSpeed;
|
||||
}
|
||||
// down arrow key
|
||||
else if (e.which === 40) {
|
||||
rightPaddle.dy = paddleSpeed;
|
||||
}
|
||||
|
||||
// w key
|
||||
if (e.which === 87) {
|
||||
leftPaddle.dy = -paddleSpeed;
|
||||
}
|
||||
// a key
|
||||
else if (e.which === 83) {
|
||||
leftPaddle.dy = paddleSpeed;
|
||||
}
|
||||
});
|
||||
|
||||
// listen to keyboard events to stop the paddle if key is released
|
||||
document.addEventListener('keyup', function(e) {
|
||||
if (e.which === 38 || e.which === 40) {
|
||||
rightPaddle.dy = 0;
|
||||
}
|
||||
if (e.which === 83 || e.which === 87) {
|
||||
leftPaddle.dy = 0;
|
||||
}
|
||||
});
|
||||
|
||||
// start the game
|
||||
requestAnimationFrame(loop);
|
||||
|
||||
287
src/pong.ts
Normal file
287
src/pong.ts
Normal file
@ -0,0 +1,287 @@
|
||||
class Box {
|
||||
x: number;
|
||||
y: number;
|
||||
width: number;
|
||||
height: number;
|
||||
|
||||
constructor(_x: number, _y: number, _width: number, _height: number) {
|
||||
this.x = _x;
|
||||
this.y = _y;
|
||||
this.width = _width;
|
||||
this.height = _height;
|
||||
}
|
||||
|
||||
collides(other: Box) {
|
||||
return this.x < other.x + other.width &&
|
||||
this.x + this.width > other.x &&
|
||||
this.y < other.y + other.height &&
|
||||
this.y + this.height > other.y;
|
||||
}
|
||||
}
|
||||
|
||||
class Paddle {
|
||||
geometry: Box;
|
||||
speed: number;
|
||||
isBot: boolean;
|
||||
isLeft: boolean;
|
||||
score: number;
|
||||
dy: number;
|
||||
|
||||
constructor() {
|
||||
this.speed = 6;
|
||||
this.isBot = true;
|
||||
this.score = 0;
|
||||
this.dy = 0;
|
||||
}
|
||||
|
||||
scored() {
|
||||
this.score++;
|
||||
}
|
||||
|
||||
updateGeometry(_geometry: Box) {
|
||||
this.geometry = _geometry;
|
||||
}
|
||||
|
||||
updateSide(_isLeft: boolean) {
|
||||
this.isLeft = _isLeft;
|
||||
}
|
||||
|
||||
input() {
|
||||
if (!this.isBot)
|
||||
return;
|
||||
let ballRegion = Math.floor(g_pong.ball.geometry.y / 15);
|
||||
let paddleRegion = Math.floor(this.geometry.y / 15);
|
||||
if (ballRegion < paddleRegion) this.dy = -this.speed;
|
||||
if (ballRegion > paddleRegion) this.dy = this.speed;
|
||||
if (ballRegion === paddleRegion) this.dy = 0;
|
||||
}
|
||||
}
|
||||
|
||||
class Ball {
|
||||
geometry: Box;
|
||||
speed: number;
|
||||
dx: number;
|
||||
dy: number;
|
||||
resetting: boolean;
|
||||
|
||||
constructor() {
|
||||
// start in the middle of the game
|
||||
this.geometry = new Box(g_pong.width / 2, g_pong.height / 2, g_pong.grid, g_pong.grid);
|
||||
this.speed = 5;
|
||||
// ball velocity (start going to the top-right corner)
|
||||
this.dx = this.speed;
|
||||
this.dy = -this.speed;
|
||||
// keep track of when need to reset the ball position
|
||||
this.resetting = false;
|
||||
}
|
||||
}
|
||||
|
||||
class PongCore {
|
||||
canvas: HTMLCanvasElement;
|
||||
context: CanvasRenderingContext2D;
|
||||
grid: number;
|
||||
timeout: number;
|
||||
width: number;
|
||||
height: number;
|
||||
gameover: boolean;
|
||||
ball: Ball;
|
||||
left: Paddle;
|
||||
right: Paddle;
|
||||
paddleHeight: number;
|
||||
paddleHeightMax: number;
|
||||
paddleSpeed: number;
|
||||
|
||||
constructor() {
|
||||
this.canvas = document.getElementById('pong') as HTMLCanvasElement;
|
||||
this.context = this.canvas.getContext('2d') as CanvasRenderingContext2D;
|
||||
this.grid = 15; // size of grid squares
|
||||
this.paddleHeight = this.grid * 5;
|
||||
this.paddleHeightMax = this.canvas.height - this.grid - this.paddleHeight;
|
||||
this.timeout = 32; // speed in ms
|
||||
this.width = this.canvas.width;
|
||||
this.height = this.canvas.height;
|
||||
this.gameover = false;
|
||||
this.paddleSpeed = 6;
|
||||
this.left.updateGeometry(new Box(this.width / 2, this.height / 2 - this.paddleHeight / 2, this.grid, this.paddleHeight));
|
||||
this.right.updateGeometry(new Box(this.width - this.grid * 3, this.height / 2 - this.paddleHeight / 2, this.grid, this.paddleHeight));
|
||||
}
|
||||
|
||||
start() {
|
||||
setInterval(this.loop, this.timeout);
|
||||
}
|
||||
|
||||
reset() {
|
||||
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
|
||||
let restartGame = document.getElementById("restart");
|
||||
let gameOverText = document.getElementById("gameover");
|
||||
restartGame.hidden = false;
|
||||
gameOverText.hidden = false;
|
||||
console.debug("[TRACE] Reset was triggered");
|
||||
this.gameover = false;
|
||||
this.left.score = 0;
|
||||
this.right.score = 0;
|
||||
this.draw();
|
||||
}
|
||||
|
||||
// Game loop
|
||||
loop() {
|
||||
// Reset of needed
|
||||
if (this.gameover)
|
||||
this.reset();
|
||||
|
||||
this.simulate();
|
||||
|
||||
this.draw();
|
||||
this.updatePageText();
|
||||
}
|
||||
|
||||
// Simulate game logic
|
||||
simulate() {
|
||||
this.left.input();
|
||||
this.right.input();
|
||||
|
||||
// move paddles by their velocity
|
||||
this.left.geometry.y += this.left.dy;
|
||||
this.right.geometry.y += this.right.dy;
|
||||
|
||||
// prevent paddles from going through walls
|
||||
if (this.left.geometry.y < this.grid) {
|
||||
this.left.geometry.y = this.grid;
|
||||
}
|
||||
else if (this.left.geometry.y > this.paddleHeightMax) {
|
||||
this.left.geometry.y = this.paddleHeightMax;
|
||||
}
|
||||
|
||||
if (this.right.geometry.y < this.grid) {
|
||||
this.right.geometry.y = this.grid;
|
||||
}
|
||||
else if (this.right.geometry.y > this.paddleHeightMax) {
|
||||
this.right.geometry.y = this.paddleHeightMax;
|
||||
}
|
||||
|
||||
// move ball by its velocity
|
||||
this.ball.geometry.x += this.ball.dx;
|
||||
this.ball.geometry.y += this.ball.dy;
|
||||
|
||||
// prevent ball from going through walls by changing its velocity
|
||||
if (this.ball.geometry.y < this.grid) {
|
||||
this.ball.geometry.y = this.grid;
|
||||
this.ball.dy *= -1;
|
||||
}
|
||||
else if (this.ball.geometry.y + this.grid > this.canvas.height - this.grid) {
|
||||
this.ball.geometry.y = this.canvas.height - this.grid * 2;
|
||||
this.ball.dy *= -1;
|
||||
}
|
||||
|
||||
// reset ball if it goes past paddle (but only if we haven't already done so)
|
||||
if ( (this.ball.geometry.x < 0 || this.ball.geometry.x > this.canvas.width) && !this.ball.resetting) {
|
||||
this.ball.resetting = true;
|
||||
|
||||
if (this.ball.geometry.x < 0) {
|
||||
this.right.scored();
|
||||
}
|
||||
if (this.ball.geometry.x > this.canvas.width) {
|
||||
this.left.scored();
|
||||
}
|
||||
|
||||
// give some time for the player to recover before launching the ball again
|
||||
setTimeout(() => {
|
||||
this.ball.resetting = false;
|
||||
this.ball.geometry.x = this.canvas.width / 2;
|
||||
this.ball.geometry.y = this.canvas.height / 2;
|
||||
}, 400);
|
||||
}
|
||||
|
||||
// check to see if ball collides with paddle. if they do change x velocity
|
||||
if (this.left.geometry.collides(this.ball.geometry)) {
|
||||
this.ball.dx *= -1;
|
||||
this.left.dy = 0;
|
||||
|
||||
// move ball next to the paddle otherwise the collision will happen again
|
||||
// in the next frame
|
||||
this.ball.geometry.x = this.left.geometry.x + this.left.geometry.width;
|
||||
}
|
||||
else if (this.right.geometry.collides(this.ball.geometry)) {
|
||||
this.ball.dx *= -1;
|
||||
this.right.dy = 0;
|
||||
|
||||
// move ball next to the paddle otherwise the collision will happen again
|
||||
// in the next frame
|
||||
this.ball.geometry.x = this.right.geometry.x - this.ball.geometry.width;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
// Draw game to canvas
|
||||
draw() {
|
||||
// Clear the screen
|
||||
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
|
||||
|
||||
// draw score
|
||||
this.context.font = "30px Arial";
|
||||
this.context.fillText(this.left.score.toString(), 200, 50);
|
||||
this.context.fillText(this.right.score.toString(), 560, 50);
|
||||
|
||||
// draw paddles
|
||||
this.context.fillStyle = 'white';
|
||||
this.fillRect(this.left.geometry);
|
||||
this.fillRect(this.right.geometry);
|
||||
|
||||
// draw ball
|
||||
this.fillRect(this.ball.geometry);
|
||||
|
||||
// draw walls
|
||||
this.context.fillStyle = "#f4dbd6";
|
||||
this.fillRect(new Box(0, 0, this.canvas.width, this.grid));
|
||||
this.fillRect(new Box(0, this.canvas.height - this.grid, this.canvas.width, this.canvas.height));
|
||||
|
||||
// draw dotted line down the middle
|
||||
for (let i = this.grid; i < this.canvas.height - this.grid; i += this.grid * 2) {
|
||||
this.fillRect(new Box(this.canvas.width / 2 - this.grid / 2, i, this.grid, this.grid);
|
||||
}
|
||||
}
|
||||
|
||||
fillRect(_box: Box) {
|
||||
this.context.fillRect(_box.x, _box.y, _box.width, _box.height);
|
||||
}
|
||||
|
||||
// Update text on page to match game
|
||||
updatePageText() {
|
||||
document.getElementById("leftPaddle").innerHTML = this.left.geometry.y.toString();
|
||||
document.getElementById("rightPaddle").innerHTML = this.right.geometry.y.toString();
|
||||
}
|
||||
}
|
||||
|
||||
// listen to keyboard events to move the paddles
|
||||
document.addEventListener('keydown', function(e) {
|
||||
// up arrow key
|
||||
if (e.which === 38) {
|
||||
g_pong.right.dy = -g_pong.paddleSpeed;
|
||||
}
|
||||
// down arrow key
|
||||
else if (e.which === 40) {
|
||||
g_pong.right.dy = g_pong.paddleSpeed;
|
||||
}
|
||||
|
||||
// w key
|
||||
if (e.which === 87) {
|
||||
g_pong.left.dy = -g_pong.paddleSpeed;
|
||||
}
|
||||
// a key
|
||||
else if (e.which === 83) {
|
||||
g_pong.left.dy = g_pong.paddleSpeed;
|
||||
}
|
||||
});
|
||||
|
||||
// listen to keyboard events to stop the paddle if key is released
|
||||
document.addEventListener('keyup', function(e) {
|
||||
if (e.which === 38 || e.which === 40) {
|
||||
g_pong.right.dy = 0;
|
||||
}
|
||||
if (e.which === 83 || e.which === 87) {
|
||||
g_pong.left.dy = 0;
|
||||
}
|
||||
});
|
||||
|
||||
const g_pong: PongCore = new PongCore();
|
||||
g_pong.start();
|
||||
Loading…
Reference in New Issue
Block a user